<template>
    <div class="list" ref="wrapper">
        <div>
            <div class="areaCur">
                <div class="title border-topbottom">当前城市
                </div>
                <div class="button-list">
                    <div
                    class="button-wrapper"
                    >
                        <div class="button">{{this.currentCity}}</div>
                    </div>
                </div>
            </div>
            <div class="areaHot">
                <div class="title border-topbottom">热门城市</div>
                <div class="button-list">
                    <div class="button-wrapper"
                    v-for="item of hot"
                    :key="item.id"
                    @click="handleCityClick(item.name)"
                    >
                        <div class="button">{{item.name}}</div>
                    </div>
                </div>
            </div>
            <!-- 这里需要二次循环 -->
            <div
            class="areaOther"
            v-for="(item, key) of cities"
            :key="key"
            :ref="key"
            >
                <div class="title border-topbottom">{{key}}</div>
                <div class="item-list">
                    <div
                    class="item border-bottom"
                    v-for="innerItem of item"
                    :key="innerItem.id"
                    @click="handleCityClick(innerItem.name)"
                    >
                        {{innerItem.name}}
                    </div>
                </div>
            </div>
        </div>
    </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default {
    name: 'CityList',
    props: {
        hot: Array,
        cities: [Object, Array],
        letter: String
    },
    computed: {
        ...mapState({
            // $store.state.city 映射到 currentCity   就可以使用this.currentCity
            currentCity: 'city'
        })
    },
    methods: {
        handleCityClick (city) {
            this.changeCity(city)
            this.$router.push('/')
        },
        ...mapMutations(['changeCity'])
    },
    mounted () {
        // 真机测试需要加 click: true
        this.scroll = new Bscroll(this.$refs.wrapper, {click: true})
    },
    // 侦听器 当数据变化时执行函数
    watch: {
        letter () {
            if (this.letter) {
                const ele = this.$refs[this.letter][0]
                this.scroll.scrollToElement(ele)
            }
        }
    }
}
</script>

<style lang="stylus" scoped>
    @import '~styles/varibles.styl'
    .border-topbottom
        &:before
            border-color: #ccc
        &:after
            border-color: #ccc
    .border-bottom
        &:before
            border-color: #ccc
    .list
        position absolute
        top 1.58rem
        left 0
        bottom 0
        right 0
        overflow hidden
        .title
            line-height .6rem
            background-color #f0f0f0
            padding-left .2rem
            color #666
            font-size .28rem
        .button-list
            padding .1rem .6rem .1rem .1rem
            overflow hidden
            .button-wrapper
                float left
                width 33.33%
                .button
                    padding .1rem 0
                    margin .1rem
                    text-align center
                    border .02rem solid #ccc
                    border-radius .1rem
                    color #333
        .item-list
            .item
                width 100%
                line-height .76rem
                color #333
                padding-left .2rem
</style>
